Buggy code:
public abstract class StringUtils { private static final String FOLDER_SEPARATOR = "//" ; private static final String WINDOWS_FOLDER_SEPARATOR = "\\" ; private static final String TOP_PATH = ".." ; private static final String CURRENT_PATH = "." ; private static final char EXTENSION_SEPARATOR = '.' ; public static boolean isEmpty ( Object str ) { } public static boolean hasLength ( CharSequence str ) { } public static boolean hasLength ( String str ) { } public static boolean hasText ( CharSequence str ) { } public static boolean hasText ( String str ) { } public static boolean containsWhitespace ( CharSequence str ) { } public static boolean containsWhitespace ( String str ) { } public static String trimWhitespace ( String str ) { } public static String trimAllWhitespace ( String str ) { } public static String trimLeadingWhitespace ( String str ) { } public static String trimTrailingWhitespace ( String str ) { } public static String trimLeadingCharacter ( String str , char leadingCharacter ) { } public static String trimTrailingCharacter ( String str , char trailingCharacter ) { } public static boolean startsWithIgnoreCase ( String str , String prefix ) { } public static boolean endsWithIgnoreCase ( String str , String suffix ) { } public static boolean substringMatch ( CharSequence str , int index , CharSequence substring ) { } public static int countOccurrencesOf ( String str , String sub ) { } public static String replace ( String inString , String oldPattern , String newPattern ) { } public static String delete ( String inString , String pattern ) { } public static String deleteAny ( String inString , String charsToDelete ) { } public static String quote ( String str ) { } public static Object quoteIfString ( Object obj ) { } public static String unqualify ( String qualifiedName ) { } public static String unqualify ( String qualifiedName , char separator ) { } public static String capitalize ( String str ) { } public static String uncapitalize ( String str ) { } private static String changeFirstCharacterCase ( String str , boolean capitalize ) { } public static String getFilename ( String path ) { } public static String getFilenameExtension ( String path ) { } public static String stripFilenameExtension ( String path ) { } public static String applyRelativePath ( String path , String relativePath ) { } public static String cleanPath ( String path ) { } public static boolean pathEquals ( String path1 , String path2 ) { } public static Locale parseLocaleString ( String localeString ) { String [ ] parts = StringUtils . tokenizeToStringArray ( localeString , "_<seq2seq4repair_space>" , false , false ) ; String language = ( ( parts . length ) > 0 ) ? parts [ 0 ] : "" ; String country = ( ( parts . length ) > 1 ) ? parts [ 1 ] : "" ; StringUtils . validateLocalePart ( language ) ; StringUtils . validateLocalePart ( country ) ; String variant = "" ; <START_BUG> if ( ( parts . length ) >= 2 ) { <END_BUG> int endIndexOfCountryCode = ( localeString . lastIndexOf ( country ) ) + ( country . length ( ) ) ; variant = StringUtils . trimLeadingWhitespace ( localeString . substring ( endIndexOfCountryCode ) ) ; if ( variant . startsWith ( "_" ) ) { variant = StringUtils . trimLeadingCharacter ( variant , '_' ) ; } } return ( language . length ( ) ) > 0 ? new Locale ( language , country , variant ) : null ; } private static void validateLocalePart ( String localePart ) { } public static String toLanguageTag ( Locale locale ) { } public static TimeZone parseTimeZoneString ( String timeZoneString ) { } public static String [ ] addStringToArray ( String [ ] array , String str ) { } public static String [ ] concatenateStringArrays ( String [ ] array1 , String [ ] array2 ) { } public static String [ ] mergeStringArrays ( String [ ] array1 , String [ ] array2 ) { } public static String [ ] sortStringArray ( String [ ] array ) { } public static String [ ] toStringArray ( Collection < String > collection ) { } public static String [ ] toStringArray ( Enumeration < String > enumeration ) { } public static String [ ] trimArrayElements ( String [ ] array ) { } public static String [ ] removeDuplicateStrings ( String [ ] array ) { } public static String [ ] split ( String toSplit , String delimiter ) { } public static Properties splitArrayElementsIntoProperties ( String [ ] array , String delimiter ) { } public static Properties splitArrayElementsIntoProperties ( String [ ] array , String delimiter , String charsToDelete ) { } public static String [ ] tokenizeToStringArray ( String str , String delimiters ) { } public static String [ ] tokenizeToStringArray ( String str , String delimiters , boolean trimTokens , boolean ignoreEmptyTokens ) { } public static String [ ] delimitedListToStringArray ( String str , String delimiter ) { } public static String [ ] delimitedListToStringArray ( String str , String delimiter , String charsToDelete ) { } public static String [ ] commaDelimitedListToStringArray ( String str ) { } public static Set < String > commaDelimitedListToSet ( String str ) { } public static String collectionToDelimitedString ( Collection < ? > coll , String delim , String prefix , String suffix ) { } public static String collectionToDelimitedString ( Collection < ? > coll , String delim ) { } public static String collectionToCommaDelimitedString ( Collection < ? > coll ) { } public static String arrayToDelimitedString ( Object [ ] arr , String delim ) { } public static String arrayToCommaDelimitedString ( Object [ ] arr ) { } }

Fix:
if ( ( parts . length ) > 2 ) {